Gmail 等邮件选择的新工具栏

Question

在Android gmail应用程序中，选择一个或多个电子邮件时，工具栏用后台，删除按钮等更改为白色背景。

如何在 Android L 中实现相同的功能？我知道如何在新 activity (getSupportActionBar().setDisplayHomeAsUpEnabled(true)) 中添加后退按钮，但找不到这个。

Answer 1

你可以找到指南here

对于 ListView 或 GridView，您可以在下面搜索 Enabling batch contextual actions in a ListView or GridView。

ListView listView = getListView();
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
listView.setMultiChoiceModeListener(new MultiChoiceModeListener() {

    @Override
    public void onItemCheckedStateChanged(ActionMode mode, int position,
                                          long id, boolean checked) {
        // Here you can do something when items are selected/de-selected,
        // such as update the title in the CAB
    }

    @Override
    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        // Respond to clicks on the actions in the CAB
        switch (item.getItemId()) {
            case R.id.menu_delete:
                deleteSelectedItems();
                mode.finish(); // Action picked, so close the CAB
                return true;
            default:
                return false;
        }
    }

    @Override
    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        // Inflate the menu for the CAB
        MenuInflater inflater = mode.getMenuInflater();
        inflater.inflate(R.menu.context, menu);
        return true;
    }

    @Override
    public void onDestroyActionMode(ActionMode mode) {
        // Here you can make any necessary updates to the activity when
        // the CAB is removed. By default, selected items are deselected/unchecked.
    }

    @Override
    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        // Here you can perform updates to the CAB due to
        // an invalidate() request
        return false;
    }
});

Gmail 等邮件选择的新工具栏

New toolbar on mail selection like Gmail

java

android

android-5.0-lollipop